JPS62109630A - Turn-up method for material constituting tyre and its device - Google Patents

Abstract

PURPOSE:To make a good turn-up without creases and the like by inserting the turn-up section into the cylindrical part which can expand, contract and move in the left or right direction, swelling the bladder and pinching the turn-up section with the bladder and the cylindrical part. CONSTITUTION:The tyre constituting material 71 molded on the molding drum 1 is inserted into the cylindrical part 49, installed on the same shaft as that of the drum, movable in left or right direction and able to expand or contract, and after contracting the diameter of cylindrical part 49, swelling the bladder 61 at the end of drum, and pinching the turn-up section 74 with the cylindrical part 49 and the bladder 61, the cylindrical part 49 is moved in the left direction of the sketch shown and the turn-up section 74 is turned up around the bead 72. By the said process, the creases at the turn-up section stretching to the direction of circumference is smoothed out to enhance the quality of turn-up section.

Description

DETAILED DESCRIPTION OF THE INVENTION 1) The present invention relates to a method and an apparatus for folding a folded portion of a tire component wound around a tire forming drum, which is located on the axially outer end side of the bead, around the bead.

Conventionally, the method of folding back the folded part of such a tire component is to inflate a bladder installed on the radially inner side of the folded part in ff1l, thereby folding the folded part in the radial direction. There is a known method in which, after being pushed and expanded, the can is moved toward the axial center of the tire forming drum using a hydraulic or air cylinder to push down the expanded bladder, thereby folding the folded portion around the beat. Second
In the same manner as in the first method, the folded portion is pushed apart in the radial direction by the first bladder, and then the second bladder installed axially outward from the first bladder is inflated and the first bladder is inserted into the tire forming drum. A method is known in which the folded portion is folded back around the bead by pushing it down toward the center in the axial direction.

However, in the first method, high-pressure oil or air must be supplied to the cylinder to drive the can, which increases equipment costs and reduces the overall strength of the device. Furthermore, if the folding conditions such as the length of the folded part change, there is a problem that the quality of the folded part will vary. Also, the second method is
High pressure (6~7 Kg7C) is applied to the first and second bladders for folding.
m') of air must be supplied, which increases the equipment cost, and if the folding conditions such as the length of the folded part change, there is a problem that the quality of the folded part will vary. . Furthermore, there is also the problem that if the height of the internal pressure of the first and second bladders, the pressurization timing, etc. are even slightly off, the folding quality will deteriorate.

100 Points Means for Solving These Problems Firstly, the folded part located on the outer end side in the axial direction from the bead of the tire component wound around the tire forming drum is folded around the bead by a bladder. A method for folding back a tire component, comprising the steps of: surrounding the folded portion with a cylindrical body coaxial with the tire component; inflating a bladder to push the folded portion outward in a radial direction;
The outer end of the folded part is held between the bladder and the cylindrical body, and the bladder is deformed and moved by moving the cylindrical body toward the axial center of the tire forming drum. Second, by a method that includes the step of folding the outer end part around the bead while holding the outer end part between the body parts, the second part of the tire component wound around the tire forming drum is located on the outer end side in the axial direction from the bead. A folding device for a tire constituent member that folds a folded part around a bead, comprising: a rubber bladder installed radially inside the folded part and capable of expanding; and a rubber bladder coaxial with the tire constituent member in the radial direction of the folded part. This problem can be solved by a device that includes a cylindrical body that can be expanded and contracted in diameter and that can surround the outside, and a moving means that moves the cylindrical body in the axial direction.

First, the outside of the folded part in the radial direction is surrounded by a cylindrical body coaxial with the folded part. At this time, since the cylindrical body can be expanded and contracted, the diameter of the cylindrical body can be adjusted to an appropriate value in response to changes in the diameter of the tire constituent members, changes in the length of the folded part, etc. , it is possible to prevent variations in tire quality based on the aforementioned changes. Next, low-pressure fluid is introduced into the bladder to inflate it and push the folded portions apart in the radial direction. As a result, the outer end of the folded portion is held between the bladder and the cylindrical body. Next, the cylindrical body is moved toward the axial center of the tire building drum by the moving means. At this time, the bladder is in close contact with the cylindrical body and cannot slide, so it deforms and moves while rolling, while the outer end of the folded part remains sandwiched between the bladder and the cylindrical body and is pulled toward the center in the axial direction. As the paper is brought together, the folded portion gradually turns over and folds back. During this folding operation, the folded part is held between the cylindrical body and the bladder and is pushed from inside by the internal pressure of the bladder, so even if there are wrinkles extending in the circumferential direction in the folded part, The wrinkles are stretched out and the quality of the folded part is improved.

Fruit” 1 case Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, 1 is a tire building drum, and this tire building drum 1 is rotatable around a horizontal axis and can expand and contract in diameter. Reference numeral 2 denotes a bed installed on a floor surface 3, and a rail 4 parallel to the axis of the tire forming drum 1 is laid on this bed 2. Reference numeral 5 denotes a moving frame that can move along the rail 4, and this moving frame 5 has a linear slide bearing 6 that is slidably supported on the rail 4. 7
is a cylinder supported by the bed 2 and having a brake mechanism, and the tip of the piston rod 8 of this cylinder 7 is connected to the movable frame 5. When the cylinder 7 operates and the piston rod 8 protrudes or retracts, the movable frame 5 approaches and moves away from the tire forming drum 1. 8.10 is a sensor that detects the position of the moving frame 5, and these sensors 9.10 detect the position of the moving frame 5 and send a signal to a control device (not shown) to control the operation of the cylinder 7. . As shown in FIG. 2.3, a rail 11 parallel to the rail 4 is laid on the moving frame 5, and a stand 13 is movably supported on this rail 11 via a linear slide bearing 12. There is. A screw shaft 14 parallel to the rail 11 is rotatably supported on the moving frame 5, and the rotation of a motor 17 is transmitted to the screw shaft 14 via a pulley 15 and a belt 18. This screw shaft 14 is screwed into a screw block 18 fixed to the stand 13, so that when the screw shaft 14 rotates, the stand 13 moves along the rail 11. The rotation of the screw shaft 14 is transmitted via the pulleys 19, 20 and the bell 21 to the encoder 22, whereby the rotation of the motor 17, and thus the position of the stand 13, is accurately measured and controlled. The stand 13 has vertical rings 26, 27 spaced apart and coaxial with the length of the rail 11. As shown in Fig. 3.4.5.6, each ring body 26, 27 is formed with a plurality of (eight in this embodiment) elongated holes 28 extending in the radial direction, and each elongated hole 28 has a shaft. 29 is inserted movably along the elongated hole 2B. Further, 30 is a rotary plate arranged on the axially outer side of each ring body 26.27 and coaxial with the ring body 26.27, and each rotary plate 30 is also formed with the same number of long holes 31 as the long holes 28. . Each elongated hole 31 is inclined with respect to the radial direction, and a roller 32 attached to the shaft 29 is inserted in a removable manner.

Reference numeral 33 denotes a guide groove formed on the inner periphery of each ring body 2B, 27, and a roller 35 rotatably supported by the rotary plate 30 rolls into contact with each guide groove 33 via a shaft 34. , the rotating plate 30 has ring bodies 2B, 2
7 is rotatably supported. 41 is a cylinder whose head side is rotatably connected to the lower end of the stand 13;
The tip of the piston rod 42 of each cylinder 41 is rotatably connected to the rotary plate 30, respectively. As a result, when the cylinder 41 is actuated, the rotary plate 30 makes a complete turn relative to the ring body 26.27, so that the shaft 29 moves synchronously in the radial direction by imitation of the elongated hole 28.31. 4B is an abbreviated slider arranged axially inside each ring body 26, 27, and these sliders 46 are fixed to the shaft 29 with a double nut 47. A proximal end of an arcuate segment plate 48 made of a spring material is fixed to the radially inner end of each slider 46, and the distal end of each segment plate 48 overlaps the proximal end of an adjacent segment plate 48. The plurality of segment plates 48 described above are collectively a cylindrical body 49 coaxial with a tire component 71 described later.
Configure. A pair of guides 50 extending in the radial direction are attached to ring bodies 26 and 27 on both circumferential sides of the slider 46, and a bearing 51 is interposed between the guides 50 and the slider 46. When the rotary plate 30 rotates relative to the ring bodies 2B and 27 and the slider 4B moves in the radial direction, the cylindrical body 49 expands and contracts while maintaining its cylindrical shape. The elongated hole 28, 31, shaft 29, rotary plate 30, cylinder 41, and slider 48 collectively constitute the expansion/contraction means 5 for expanding and contracting the cylindrical body 49.
The screw shaft 14 and the motor 17 collectively constitute a moving means 53 for moving the cylindrical body 48 in the axial direction of the tire forming drum 1. In FIG. 2.3, 55 is a plate attached to the ring body 26, 27, and a stopper bolt 56 is screwed into each plate 55. Reference numeral 57 denotes a stopper plate fixed to each rotary plate 30, and the rotation limit of the rotary plate 30 is defined by these stopper plates 57 coming into contact with the stopper bolts 58, respectively. Note that the rotation limit can be adjusted by adjusting the screwing position of the stopper bolt 56, but this position adjustment can be done manually by the operator, or by connecting a motor to the stopper bolt 56 and rotating the motor. You may do so. In FIG. 1.5, reference numerals 61 indicate bladders provided at both axial ends of the tire building drum 1, and each bladder 61 is attached to the tire building drum 1 with both base ends sealed. Each bladder 6
1 is entirely made of rubber, and a reinforcing layer 62 made of textile, steel, etc. is embedded at the base end of the drum 1 on the side close to the axial center of the tire forming drum 1. The tip 63 of this reinforcing layer 62 is connected to the seventh
As shown in Figure (a), it is preferable to extend to a position axially away from a bead 72, which will be described later, by a distance X, OCrn~0.50 m. The reason is that the distance gIX
is less than QCs, when the bladder 81 is inflated, the reinforcing layer 6
This is because the bladder 61 is easily damaged if it is bent at an excessive angle from the tip 63 of the tip 2, and the distance
This is because if the distance exceeds 0 m, the bladder 61 deforms into an arc shape during inflation and comes into contact with the tire component 71 at a position away from the bead.

Next, the operation of one embodiment of the present invention will be explained.

First, as shown in FIG. 7(a), a tire component 71, such as a carcass ply, is wound around the outer periphery of the tire forming drum l in an expanded diameter state. At this time, the bladder 61 is not filled with air, and the bladder 81 is contracted and lies flat. Next, a pair of beads 72 and a filler 73 are set at both axial ends of the tire component 71, respectively. At this time, the tire component 71 on the axially outer end side of each bead 72 becomes a folded part 74, and a bladder 81 is located inside each folded part 74 in the radial direction. Next, the cylinder 7 is actuated to cause the piston rod 8 to protrude. As a result, the moving frame 5 approaches the tire forming drum 1 while being guided by the rails 4. When the movable frame 5 reaches a predetermined position, the sensor 10 sends a signal to the cylinder 7 via the control device, causing the cylinder 7 to apply a brake. At this time,
The cylindrical body 49 surrounds the folded portion 74 on the radial side. Next, the cylinder 41 is operated to rotate the rotary plate 30 until the stopper plate 57 comes into contact with the stopper bolt 56. This rotation of the rotating plate 30 causes the shaft 28 to synchronously move radially inward due to the effect of the elongated hole 28.31, and the cylindrical body 49 moves as shown in FIG. 7(a).
The diameter is reduced from the position shown by the imaginary line to the position shown by the solid line.

At this time, each segment plate 48 slides on the adjacent segment plate 48 and is elastically deformed so that the radius of curvature becomes smaller, and the entire segment plate 48 maintains its cylindrical shape.

Next, as shown in FIG.
8 Kg/Cr? The bladder 61 is inflated by filling it with air at a moderately low pressure. At this time, since the reinforcing layer 62 is partially embedded in the bladder 61, the rigidity of this part is higher than the remaining part, and as a result, even when the bladder 61 is inflated, the part where the reinforcing layer 62 is embedded is Maintain a state almost parallel to the axis of the tire forming drum 1. For this reason, the bladder 6
1 expands in a substantially perpendicularly bent state from the tip 63 of the reinforcing layer 62 located very close to the bead 72. As a result, the folded portion 74 begins to be folded back by the bladder 81 at a portion bent to a power of a number from the pole near the folding start point (distribution position W!i of the beads 72). When the bladder 61 further expands, the folded portion 74 is gradually expanded as a whole, and the outer end in the axial direction
1 and the cylindrical body 49. At this time, the length Y of the folded portion 74 held between the bladder 61 and the cylindrical body 48 is preferably in the range of 3% to 70% of the total length Z of the folded portion 74. The reason for this is that if it is less than 3%, the folded part 74 will be damaged by the bladder 61 and the cylindrical body 48 during folding.
If it exceeds 70%, the gap between the cylindrical body 49 and the tire forming drum 1 will become extremely narrow, and the bladder 61 will not be able to enter between them. be.

Next, as shown in FIG. 7(c), the motor 17 is operated while being accurately controlled by the encoder 22, and the screw shaft 1 is
Rotate 4. As a result, the stand 13, the cylindrical body 4
9 move together toward the axial center of the tire forming drum 1 while being guided by the rails 11. At this time, since the bladder 81 is in close contact with the inner surface of the cylindrical body 49 and cannot slide, it deforms and moves toward the axial center of the tire building drum 1 while shifting. Therefore, the outer end of the folded portion 74 is pulled toward the center in the axial direction while being held between the cylindrical body 49 and the bladder 81, and as a result, the folded portion 74 is gradually reversed and folded back around the bead. . In this way, the folded portion 74 gradually becomes bead 72 due to the bladder 61 that has been deformed and moved.
and is pressed against the filler 73, and is brought into close contact with the filler 73 while air is being discharged.

Next, as shown in FIG. 7(d), when the cylindrical body 49 further moves toward the axial center of the tire forming drum 1, the bladder 81 is moved into the narrow gap between the cylindrical body 48 and the tire forming drum 1. It enters while deforming, and further folds back the folded portion 74. When the amount of penetration of the bladder θ1 becomes approximately equal to the length of the folded portion 74, the folded portion 74 is released from being held between the cylindrical body 48 and the bladder 81 and is completely folded back. During this folding, the outer end of the folded part 74 is held between the cylindrical body 48 and Prada B1, and
Since it is pressed from the inside by the internal pressure of the bladder 61, tension in the axial direction acts on the folded portion 74, and as a result, even if the folded portion 74 has wrinkles extending in the circumferential direction, the wrinkles are stretched out. , the folding quality of the folding section 74 is improved. In this way, the tire forming drum shown in FIG.
When the right side of the tire forming drum 1 is turned back, the movable frame 5 is further advanced until the sensor 9 detects it, and the left side of the tire forming drum 1 is turned back in the same manner as described above. When the length of the folded portion 74 changes, the diameter of the cylindrical body 49 can be adjusted to an appropriate value by expanding or contracting accordingly. Variations in quality can be prevented.

As described above, according to the present invention, equipment costs can be reduced and the quality of the folded portion can be made good and uniform.

[Brief explanation of drawings]

Fig. 1 is a schematic front view showing an embodiment of the present invention, Fig. 2 is a front view of the movable frame and the vicinity of the cylindrical body, Fig. 3 is a left side view of Fig. 2, and Fig. 4 is a side view of the vicinity of the slider. Figure 5 is a cross-sectional view taken along the line I--I in Figure 4, Figure 6 is a cross-sectional view taken along the ■-■ arrow in Figure 4, and Figures 7 (a) to (d) are explanations explaining the action. It is a diagram. 1... Tire forming drum 49... Cylindrical body 53... Moving means 61.
... Bladder B2 ... Reinforcement layer □71 ... Tire component 72 ... Bead 74 ... Turned part Patent applicant Brideston Co., Ltd. Agent Patent attorney Ta 1) Toshio Figure 2 53... Transportation means Fig. 3 Fig. 4 1'' Fig. 5 61... Prada 62... Reinforcement layer Fig. 6 Fig. 7 71... Tire component 72... Bead 74... Turned part

Claims (2)

[Claims] (1) A method for folding a tire constituent member, in which a folded part located on the outer end side in the axial direction from a bead of a tire constituent member wound around a tire forming drum is folded around the bead by a bladder, the folded part being used to form a tire. A step of surrounding the member with a cylindrical body coaxial with the member, a step of inflating the bladder to push the folded part outward in the radial direction, and sandwiching the outer end of the folded part between the bladder and the cylindrical body, and forming the cylindrical body into a tire. deforming and moving the bladder by moving it toward the axial center of the drum, thereby folding the folded portion around the bead while holding its outer end between the bladder and the cylindrical body. Features: A method for folding tire components. (2) A tire component folding device that folds back a folded portion located on the axially outer end side of a tire component wrapped around a tire forming drum around the bead,
a rubber bladder that is installed inside the folded part in the radial direction and is inflatable; a cylindrical body that is coaxial with the tire component and whose diameter can be expanded and contracted and that can surround the outside of the folded part in the radial direction; A folding device for a tire component, comprising: a moving means for moving the tire component.